SageThumbs 2K 0.4.7

Stability release — fixes shell and preview-pane hangs.

Fixes

• Preview pane no longer hangs. Selecting an image in the file dialog / Explorer preview pane could freeze (sometimes needing prevhost.exe to be killed). The preview now decodes off the host thread, and an internal concurrency lock that could leak when a host was force-killed is now self-healing — so the hang can no longer accumulate until a reboot.
• Right-clicking an exotic file can no longer freeze Explorer. The classic context-menu preview now uses only fast in-process decoders (no ImageMagick/video/PDF/SVG on the shell thread).
• Video frame-grabs are time-bounded, so a stalling codec can't hang the thumbnail/preview.
• Context-menu actions (Convert, Resize, Rotate, etc.) now run in the background instead of blocking the Explorer window until they finish.

New

• Lazy update check. Opening Settings now does a quiet, once-a-day background check for a newer version and, if one exists, labels the "Check for updates" button accordingly — no nagging pop-ups, no checking more than once a day.

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Windows 11. Unsigned (SmartScreen may warn — "More info → Run anyway"). Free for personal use (PolyForm Noncommercial).